%main.container
  - (1..40).each do |i|
    %span.particle 4
  
  - (1..40).each do |i|
    %span.particle 0
    
  %article.content
    %p Damnit stranger,
    %p You got lost in the <strong>404</strong> galaxy.
    %p
      %button Go back to earth.

$anims: float, floatReverse,float2, floatReverse2;
$easeSmooth: cubic-bezier(0.39,0.575,0.28,0.995);
$color: #595959;

body {margin: 0;font-size: 20px;}
* {box-sizing: border-box;}

.container {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background: white;
  color: black;
  font-family: arial, sans-serif;
  overflow: hidden;
}

.content {
  position: relative;
  width: 600px;
  max-width: 100%;
  margin: 20px;
  background: white;
  padding: 60px 40px;
  text-align: center;
  box-shadow: -10px 10px 67px -12px rgba(0,0,0,0.2);
  opacity: 0; 
  animation: apparition 0.8s 1.2s $easeSmooth forwards;
  
  p {
    font-size: 1.3rem;
    margin-top: 0;
    margin-bottom: 0.6rem;
    letter-spacing: 0.1rem;
    color: $color;
    
    &:last-child{margin-bottom: 0;}
  }
  
  button {
    display: inline-block;
    margin-top: 2rem;
    padding: 0.5rem 1rem;
    border: 3px solid $color;
    background: transparent;
    font-size: 1rem;
    color: $color;
    text-decoration: none;
    cursor: pointer;
    font-weight: bold;
  }
}

.particle {
  position: absolute;
  display: block;
  pointer-events: none;
  
  @for $i from 1 through 80 {
    &:nth-child(#{$i}){
      $size: random(20) + 10;
      $blur: $i * 0.02;
      $speed: random(20)+20; 
      $delay: random(10)*0.1;
      $anim: nth($anims, random(length($anims)));
      
      top: random(100) / (100 + $size/8) * 100%;
      left: random(100) / (100 + $size/10) * 100%;
      font-size: $size + px;
      filter: blur( (#{$blur}) + px);
      animation: $speed+s  $anim infinite;
    }
  }
}

@keyframes apparition {
  from {
    opacity: 0;
    transform: translateY(100px);
  }
  
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%,100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(180px);
  }
}

@keyframes floatReverse {
  0%,100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-180px);
  }
}
  
@keyframes float2 {
  0%,100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(28px);
  }
}

@keyframes floatReverse2 {
  0%,100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-28px);
  }
}

@mixin animation ($delay, $duration, $animation) {
  animation-delay: $delay;
  animation-duration: $duration;
  animation-name: $animation;
  animation-iteration-count: infinite;
  animation-fill-mode: forwards;
}

// Nope